<template>
  <div class="app-container">
    <h2 style="text-align: center;">发布新课程</h2>
    <el-steps :active="2" process-status="wait" align-center style="margin-bottom: 40px;">
      <el-step title="填写课程基本信息"/>
      <el-step title="创建课程大纲"/>
      <el-step title="最终发布"/>
    </el-steps>
    
    <el-button type="text" @click="openChapterDialog">添加章节</el-button>

    <!-- 章节 -->
    <ul class="chanpterList">
        <li v-for="chapter in chapterVideoList"
            :key="chapter.id">
            <p>
                {{ chapter.title }}
                <span class="acts">
                  <el-button style="" type="text" @click="openVideo(chapter.id)">添加小节</el-button>
                  <el-button style="" type="text" @click="openEditChapter(chapter.id)">编辑</el-button>
                  <el-button type="text" @click="removeChapter(chapter.id)">删除</el-button>
                </span>
            </p>
            <!-- 视频 -->
            <ul class="chanpterList videoList">
                <li
                    v-for="video in chapter.children"
                    :key="video.id">
                    <p>
                      {{ video.title }}
                      <span class="acts">
                        <!-- TODO 完成编辑 -->
                        <el-button style="" type="text" @click="openEditVidoe(video.id)">编辑</el-button>
                        <el-button type="text" @click="removeVideo(video.id)">删除</el-button>
                      </span>
                    </p>
                </li>
            </ul>
        </li>
    </ul>
    <div>
        <el-button @click="previous">上一步</el-button>
        <el-button :disabled="saveBtnDisabled" type="primary" @click="next">下一步</el-button>
    </div>

    <!-- 添加和修改章节表单 -->
    <el-dialog :visible.sync="dialogChapterFormVisible" title="添加章节">
        <el-form :model="chapter" label-width="120px">
            <el-form-item label="章节标题">
                <el-input v-model="chapter.title"/>
            </el-form-item>
            <el-form-item label="章节排序">
                <el-input-number v-model="chapter.sort" :min="0" controls-position="right"/>
            </el-form-item>
        </el-form>
        <div slot="footer" class="dialog-footer">
            <el-button @click="dialogChapterFormVisible = false">取 消</el-button>
            <el-button type="primary" @click="saveOrUpdate">确 定</el-button>
        </div>
    </el-dialog>

    <!-- 添加和修改课时表单 -->
    <el-dialog :visible.sync="dialogVideoFormVisible" title="添加课时">
      <el-form :model="video" label-width="120px">
        <el-form-item label="课时标题">
          <el-input v-model="video.title"/>
        </el-form-item>
        <el-form-item label="课时排序">
          <el-input-number v-model="video.sort" :min="0" controls-position="right"/>
        </el-form-item>
        <el-form-item label="是否免费">
          <el-radio-group v-model="video.free">
            <el-radio :label="true">免费</el-radio>
            <el-radio :label="false">默认</el-radio>
          </el-radio-group>
        </el-form-item>

        <el-form-item label="上传视频">
            <el-upload
                  :on-success="handleVodUploadSuccess"
                  :on-remove="handleVodRemove"
                  :before-remove="beforeVodRemove"
                  :on-exceed="handleUploadExceed"
                  :file-list="fileList"
                  :action="BASE_API+'/eduvod/video/uploadAlyVideo'"
                  :limit="1"
                  class="upload-demo">
            <el-button size="small" type="primary">上传视频</el-button>
            <el-tooltip placement="right-end">
                <div slot="content">最大支持1G，<br>
                    支持3GP、ASF、AVI、DAT、DV、FLV、F4V、<br>
                    GIF、M2T、M4V、MJ2、MJPEG、MKV、MOV、MP4、<br>
                    MPE、MPG、MPEG、MTS、OGG、QT、RM、RMVB、<br>
                    SWF、TS、VOB、WMV、WEBM 等视频格式上传</div>
                <i class="el-icon-question"/>
            </el-tooltip>
            </el-upload>
        </el-form-item>

      </el-form>
      <div slot="footer" class="dialog-footer">
        <el-button @click="dialogVideoFormVisible = false">取 消</el-button>
        <el-button :disabled="saveVideoBtnDisabled" type="primary" @click="saveOrUpdateVideo">确 定</el-button>
      </div>
    </el-dialog>

  </div>
</template>

<script>
import chapter from '@/api/edu/chapter'
import video from '@/api/edu/video'

export default {
  data() {
    return {
      saveBtnDisabled: false, // 保存按钮是否禁用
      chapterVideoList:[],
      courseId:'',//课程id
      dialogChapterFormVisible:false, //章节弹框
      dialogVideoFormVisible:false, //小节弹框
      video:{
        title: '',
        sort: 0,
        free: 0,
        videoSourceId: '',
        videoOriginalName:'' //视频名称
      },
      chapter:{ //封装章节的数据
        title:'',
        sort:0
      },
      fileList:[], //上传文件列表
      BASE_API:process.env.BASE_API  //接口API地址
    }
  },
  created() {
    //获取到路由中的id值
    if(this.$route.params && this.$route.params.id){
        this.courseId=this.$route.params.id
        this.getChapterVideo()
    }
  },
  methods: {
    //点击确定调用的方法
    handleVodRemove(){
      //调用接口删除视频的方法
      video.deleteAlyVideo(this.video.videoSourceId)
        .then(response =>{
           //提示
            this.$message({
              type:'success',
              message:'删除视频成功'
            })
            //把文件列表清空
            this.fileList=[]
            //把video视频id和视频名称清空
            this.video.videoSourceId=''
            this.video.videoOriginalName=''
        })
    },
    //点击X调用这个方法
    beforeVodRemove(file,fileList){
      return this.$confirm(`确定移除 ${file.name}?`)
    },
    //上传视频成功调用
    handleVodUploadSuccess(response,file,fileList){
      //上传之后视频ID赋值
      this.video.videoSourceId=response.data.videoId
      //上传视频名称赋值
      this.video.videoOriginalName = file.name
    },
    handleUploadExceed(){
      this.$message.warning('想要重新上传视频,请先删除已上传的视频')
    },
//===================================================================================小节操作====================================================================
    //更新小节内容
     updateVideo(){
        video.updateVideor(this.video)
            .then(response => {
            //关闭弹窗
            this.dialogVideoFormVisible=false
            //提示
            this.$message({
              type:'success',
              message:'修改小节成功'
            })
            //刷新页面
            this.getChapterVideo()
          })
    },
    //修改小节内容回显
    openEditVidoe(videoId){
        //调用弹窗
        this.dialogVideoFormVisible=true
        //调用接口
        video.getVideo(videoId)
          .then(response => {
            this.video = response.data.videoInfo
          })
    },
    //删除小节
    removeVideo(id){
       this.$confirm('此操作将删除小节记录, 是否继续?', '提示', {
            confirmButtonText: '确定',
            cancelButtonText: '取消',
            type: 'warning'
          }).then(() => {  //点击确认,执行then方法
          //调用删除的方法
              video.deleteVideo(id)
                  .then(response => { //删除成功
                    this.$message({
                    type: 'success',
                    message: '删除小节成功!'
                  })  
              //刷新页面
              this.getChapterVideo()             
              })
          })
    },
    //添加小节弹框的方法
    openVideo(chapterId){
       this.fileList=[]
      this.video={free:0,sort:0}
      //弹框
      this.dialogVideoFormVisible=true
      //设置章节Id
      this.video.chapterId = chapterId
     
    },

    //添加小节
    addVideo(){
      //设置一个课程Id
      this.video.courseId=this.courseId
      video.addVideo(this.video)
        .then(response =>{
            //关闭弹窗
          this.dialogVideoFormVisible=false
          //提示
          this.$message({
            type:'success',
            message:'添加小节成功'
          })
          //刷新页面
          this.getChapterVideo()
        })
    },
    saveOrUpdateVideo(){
      if(!this.video.id){
        this.addVideo()
      }else{
        this.updateVideo()
      }
      
    },
//===================================================================================章节操作====================================================================
    //删除章节
    removeChapter(chapterId){
      this.$confirm('此操作将删除章节记录, 是否继续?', '提示', {
            confirmButtonText: '确定',
            cancelButtonText: '取消',
            type: 'warning'
          }).then(() => {  //点击确认,执行then方法
          //调用删除的方法
              chapter.deleteChapter(chapterId)
                  .then(response => { //删除成功
                    this.$message({
                    type: 'success',
                    message: '删除成功!'
                  })  
              //刷新页面
              this.getChapterVideo()             
              })
          })
    },
    //修改章节弹窗数据回显
    openEditChapter(chapterId){
      //调用弹框
       this.dialogChapterFormVisible=true
       //调用接口
      chapter.getChapter(chapterId)
        .then(response =>{
          this.chapter=response.data.eduChapter
        })
    },
    //弹出添加章节页面
    openChapterDialog(){
      //清空
      this.chapter={sort:this.chapter.sort+1}
      //弹框
      this.dialogChapterFormVisible=true
    },
    //添加章节
    addChapter(){
      //设置课程id到chapter对象里面
      this.chapter.courseId=this.courseId
      chapter.addChapter(this.chapter)
        .then(response => {
          //关闭弹窗
          this.dialogChapterFormVisible=false
          //提示
          this.$message({
            type:'success',
            message:'添加章节成功'
          })
          //刷新页面
          this.getChapterVideo()
        })
    },
    //修改章节
    updateChapter(){
        chapter.updateChapter(this.chapter)
            .then(response => {
            //关闭弹窗
            this.dialogChapterFormVisible=false
            //提示
            this.$message({
              type:'success',
              message:'修改章节成功'
            })
            //刷新页面
            this.getChapterVideo()
          })
    },
    //添加章节
    saveOrUpdate(){
      if(!this.chapter.id){
        this.addChapter()
      }else{
        this.updateChapter()
      }
      
    },
    //根据课程id查询章节和小节的列表
    getChapterVideo(){
      chapter.getAllChapterVideo(this.courseId)
        .then(response =>{
          this.chapterVideoList = response.data.allChapterVideo
        })
    },
    previous() {
      console.log('previous')
      this.$router.push({ path: '/course/info/'+this.courseId })
    },
    next() {
      console.log('next')
      this.$router.push({ path: '/course/publish/'+this.courseId })
    }
  }
}
</script>

<style scoped>
.chanpterList{
    position: relative;
    list-style: none;
    margin: 0;
    padding: 0;
}
.chanpterList li{
  position: relative;
}
.chanpterList p{
  float: left;
  font-size: 20px;
  margin: 10px 0;
  padding: 10px;
  height: 70px;
  line-height: 50px;
  width: 100%;
  border: 1px solid #DDD;
}
.chanpterList .acts {
    float: right;
    font-size: 14px;
}

.videoList{
  padding-left: 50px;
}
.videoList p{
  float: left;
  font-size: 14px;
  margin: 10px 0;
  padding: 10px;
  height: 50px;
  line-height: 30px;
  width: 100%;
  border: 1px dotted #DDD;
}

</style>